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Too the original question - avoiding interfence - my only suggestion is to try and group and seperate power from signal wires.
I try and seperately group power wiring (A/C or D/C) from signal wires. Rather than have two tight groups of wires - power I keep together - signal I seperate by at least 15 cms and try not to have tightly grouped.
USB I treat more as signal than power.
My two cents - keen to hear what others think!
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